How much grass seed do I need for half an acre?
To cover half an acre, you need about 152 lb of grass seed for a new lawn — a typical tall-fescue rate — or about 76.2 lb to overseed a thin existing lawn. Across common grass types the new-lawn amount ranges from 32.7 lb to 174 lb.
Grass seed for ½ acre, by grass type
| Grass type | New lawn (pounds) | Overseeding (pounds) |
|---|---|---|
| Tall Fescue | 152 lb | 76.2 lb |
| Kentucky Bluegrass | 54.5 lb | 32.7 lb |
| Perennial Ryegrass | 174 lb | 87.1 lb |
| Bermuda | 32.7 lb | 21.8 lb |
| Generic / mixed | 109 lb | 54.5 lb |
Rates are typical U.S. cooperative-extension ranges (mid-range), applied to 21,780 sq ft. Your seed bag's label is the authority — read it and adjust, and buy about 5–10% extra for edges and thin spots.
Frequently asked questions
How much grass seed do I need for half an acre?
For half an acre, plan on about 152 lb of grass seed for a new lawn, or about 76.2 lb for overseeding, using a typical tall-fescue rate. The exact amount depends on the grass type — across common cool- and warm-season grasses the new-lawn figure ranges from 32.7 lb to 174 lb. Enter your real dimensions in the calculator above to get a number for your specific lawn and seed.
Does the grass type change how much seed I need for ½ acre?
Yes — a lot. Fine, spreading grasses like Kentucky bluegrass need far less than bunch grasses. For ½ acre, a new lawn needs about 54.5 lb of Kentucky bluegrass but about 174 lb of perennial ryegrass. The table on this page lists every common grass type so you can match your seed bag.
How is the grass seed amount for ½ acre calculated?
Seed is applied at a rate in pounds per 1,000 square feet, so pounds = rate × (area ÷ 1,000). This page works from 21,780 square feet; enter your own dimensions above — in feet, yards or metres — and the calculator does the arithmetic, including the metric conversion, for you.
Are these seeding rates exact?
They are typical U.S. cooperative-extension ranges, chosen mid-range and rounded for a planning estimate. Your seed bag's label is the real authority: it gives the exact rate for that blend and whether it is a new-lawn or overseeding rate. Always read the bag and adjust, and buy about 5–10% extra for edges and thin spots.
Grass seed for other sizes
For 1,000 sq ftFor 1 acreFor 2 acresFor 100 m²Per square footPer square metreTo overseed New lawn vs overseeding Full calculator →